[SC TO-C] Adverum Biotechnologies, Inc. Tender Offer Communication

Rhea-AI Filing Summary

Adverum Biotechnologies (ADVM) is the target of a planned tender offer by Eli Lilly and Company via its wholly owned subsidiary, Flying Tigers Acquisition Corporation, under an Agreement and Plan of Merger dated October 24, 2025.

The tender offer has not yet commenced. Upon commencement, Lilly and its subsidiary will file tender offer materials on Schedule TO, and Adverum will file a Schedule 14D-9 to provide its position. These documents will be available on the SEC’s website and at Lilly’s investor site, and mailed to stockholders at no charge.

The communication includes forward-looking statements noting uncertainties around closing, potential contingent consideration, and availability of financing under a promissory note. Completion of the acquisition is not guaranteed and remains subject to customary conditions.

Insights

M&A analyst

Pre-commencement notice of a Lilly tender offer for ADVM; terms and closing remain contingent.

Eli Lilly plans to acquire Adverum Biotechnologies through a tender offer by its subsidiary, aligned with a October 24, 2025 merger agreement. This is a Schedule TO-C, meaning the tender offer has not begun and no price or final terms appear in this excerpt.

Next steps include Schedule TO filings by Lilly and a Schedule 14D-9 by Adverum. Investor decisions will hinge on those definitive documents, which outline offer mechanics, conditions, and any contingencies.

The forward-looking statements flag risks typical of tender offers, including uncertainty of completion and potential contingent consideration. Actual impact will depend on tender participation and satisfaction of closing conditions disclosed in forthcoming materials.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE TO

Tender Offer Statement under Section 14(d)(1) or 13(e)(1)

of the Securities Exchange Act of 1934

ADVERUM BIOTECHNOLOGIES, INC.

(Name of Subject Company (issuer))

FLYING TIGERS ACQUISITION CORPORATION

(Offeror)

A wholly-owned subsidiary of

ELI LILLY AND COMPANY

(Parent of Offeror)

(Names of Filing Persons (identifying status as offeror, issuer or other person))

Common stock, $0.0001 par value per share

(Title of Class of Securities)

00773U207

(CUSIP Number of Class of Securities)

Anat Hakim

Executive Vice President, General Counsel and Secretary

Eli Lilly and Company

Lilly Corporate Center

Indianapolis, Indiana 46285

Telephone: (317) 276-2000

(Name, address, and telephone numbers of person authorized to receive notices and communications on behalf of filing persons)

Copy to:

Emily Oldshue

Ropes & Gray, LLP

800 Boylston Street, Prudential Tower

Boston, MA 02199

☒ Check the box if the filing relates solely to preliminary communications made before the commencement of a tender offer.

Check the appropriate boxes below to designate any transactions to which the statement relates:

☒ Third-party tender offer subject to Rule 14d-1.

☐ Going-private transaction subject to Rule 13e-3.

☐ Issuer tender offer subject to Rule 13e-4.

☐ Amendment to Schedule 13D under Rule 13d-2.

Check the following box if the filing is a final amendment reporting the results of the tender offer: ☐

If applicable, check the appropriate box(es) below to designate the appropriate rule provision(s) relied upon:

☐ Rule 13e-4(i) (Cross-Border Issuer Tender Offer).

☐ Rule 14d-1(d) (Cross-Border Third-Party Tender Offer).

This Tender Offer Statement on Schedule TO relates solely to preliminary communications made before the commencement of a planned tender offer by Flying Tigers Acquisition Corporation, a Delaware corporation (“Purchaser”) and a wholly owned subsidiary of Eli Lilly and Company, an Indiana corporation (“Lilly”), for all of the outstanding shares of common stock of Adverum Biotechnologies, Inc., a Delaware corporation (the “Company”), pursuant to the Agreement and Plan of Merger, dated as of October 24, 2025 (the “Merger Agreement”), among Lilly, Purchaser and the Company.

In connection with the proposed acquisition of the Company, Lilly will cause Purchaser to commence a tender offer for all of the outstanding shares of common stock of the Company. The tender offer has not yet commenced. This filing is for informational purposes only, is not a recommendation and is neither an offer to purchase nor a solicitation of an offer to sell any securities, nor is it a substitute for the tender offer materials that Lilly and Purchaser will file with the United States Securities and Exchange Commission (the “SEC”) upon commencement of the tender offer. A solicitation and offer to buy outstanding shares of the Company will only be made pursuant to the tender offer materials that Lilly and Purchaser intend to file with the SEC. At the time the tender offer is commenced, Lilly and Purchaser will file tender offer materials on Schedule TO, and the Company will file a solicitation/recommendation statement on Schedule 14D-9 (the “Solicitation/Recommendation Statement”) with the SEC with respect to the tender offer. THE TENDER OFFER MATERIALS (INCLUDING AN OFFER TO PURCHASE, A RELATED LETTER OF TRANSMITTAL AND CERTAIN OTHER TENDER OFFER DOCUMENTS) AND THE SOLICITATION/RECOMMENDATION STATEMENT WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED ACQUISITION AND THE PARTIES THERETO. INVESTORS AND STOCKHOLDERS OF THE COMPANY ARE URGED TO READ THESE DOCUMENTS CAREFULLY WHEN THEY BECOME AVAILABLE (AND EACH AS IT MAY BE AMENDED OR SUPPLEMENTED FROM TIME TO TIME) BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION THAT INVESTORS AND STOCKHOLDERS OF THE COMPANY SHOULD CONSIDER BEFORE MAKING ANY DECISION REGARDING TENDERING THEIR SHARES OF COMMON STOCK IN THE TENDER OFFER. The tender offer materials (including the Offer to Purchase and the related Letter of Transmittal), as well as the Solicitation/Recommendation Statement, will be made available to all stockholders of the Company at no expense to them at Lilly’s website at investor.lilly.com and (once they become available) will be mailed to the stockholders of the Company free of charge. The information contained in, or that can be accessed through, Lilly’s website is not a part of, or incorporated by reference in, this filing. The tender offer materials (including the Offer to Purchase and the related Letter of Transmittal), as well as the Solicitation/Recommendation Statement, will also be made available for free on the SEC’s website at www.sec.gov. In addition to the Offer to Purchase, the related Letter of Transmittal and certain other tender offer documents, as well as the Solicitation/Recommendation Statement, Lilly and the Company file annual, quarterly and current reports, proxy statements and other information with the SEC. You may read any reports, statements or other information filed by Lilly and the Company with the SEC for free on the SEC’s website at www.sec.gov.

Cautionary Statement Regarding Forward-Looking Statements

This filing contains forward-looking statements regarding Lilly’s proposed acquisition of the Company, regarding prospective benefits of the proposed acquisition and the Company’s gene editing programs for retinal disease, regarding potential contingent consideration amounts and terms, regarding the anticipated occurrence, manner and timing of the proposed tender offer and the closing of the proposed acquisition, regarding the Company’s cash runway and prospects, regarding the potential availability of financing to the Company under the Promissory Note (the “Promissory Note”) that the Company has entered into with Lilly in conjunction with the proposed acquisition, regarding the Company’s product candidates and ongoing clinical and preclinical development, and regarding Lilly’s development of programs for ophthalmology and advancement of gene therapies. All statements other than statements of historical fact are statements that could be deemed forward-looking statements. Forward-looking statements involve inherent risks and uncertainties, including with respect to consummating the proposed acquisition and any competing offers or acquisition proposals for the Company, drug research, development and commercialization, the Company’s prospects, uncertainties as to how many of the Company’s stockholders will tender their stock in the tender offer, the effects of the proposed acquisition (or the announcement thereof) on the Company’s stock price, relationships with key third parties or governmental entities, regulatory changes and developments, the impact of global macroeconomic conditions, including trade and other global disputes and interruptions, including related to tariffs, trade protection measures, and similar restrictions, transaction costs, risks that the proposed acquisition

disrupts current plans and operations or adversely affects employee retention, potentially diverting management’s attention from the Company’s ongoing business operations, changes in the Company’s business during the period between announcement and closing of the proposed acquisition, and any legal proceedings that may be instituted related to the proposed acquisition. Actual results could differ materially due to various factors, risks and uncertainties. Among other things, there can be no guarantee that the proposed acquisition will be completed in the anticipated timeframe or at all, that the conditions required to complete the proposed acquisition or provide the Company financing under the Promissory Note will be met, that any event, change or other circumstance that could give rise to the termination of the Merger Agreement or the Promissory Note will not occur, that Lilly will realize the expected benefits of the proposed acquisition, that product candidates will be approved on anticipated timelines or at all, that any products, if approved, will be commercially successful, that all or any of the contingent consideration will become payable on the terms described herein or at all, that Lilly’s financial results will be consistent with its expected 2025 guidance or that Lilly can reliably predict the impact of the proposed acquisition on its financial results or financial guidance. For further discussion of these and other risks and uncertainties, see Lilly’s and the Company’s most recent Form 10-K and Form 10-Q filings with the SEC. Except as required by law, neither Lilly nor the Company undertakes any duty to update forward-looking statements to reflect events after the date of this filing.

Item 12. Exhibits

Exhibit No.		Description
Exhibit 99.1		Joint Press Release issued on October 24, 2025

FAQ

What is happening with Adverum Biotechnologies (ADVM)?

Eli Lilly plans a tender offer for all outstanding ADVM common shares via its subsidiary, Flying Tigers Acquisition Corporation, under a merger agreement dated October 24, 2025.

Has the tender offer for ADVM commenced?

No. The tender offer has not yet commenced. Formal materials will be filed on Schedule TO when it begins.

What filings will be made for the ADVM tender offer?

Lilly and its subsidiary will file Schedule TO tender offer materials, and Adverum will file a Schedule 14D-9 Solicitation/Recommendation Statement.

Where can ADVM stockholders access the tender documents?

They will be available for free on www.sec.gov, at Lilly’s investor site (investor.lilly.com), and mailed to stockholders at no charge.

Are there conditions or risks to the ADVM acquisition closing?

Yes. The communication notes uncertainties regarding completion, potential contingent consideration, and possible financing under a promissory note.

Who is the offeror in the ADVM transaction?

Flying Tigers Acquisition Corporation, a wholly owned subsidiary of Eli Lilly and Company.